in the deadly libyan embassy and consulate attacks this. time, it's senator bob corker who wants the interior director of national intelligence to explain why the fbi has want been able to make it in to benghazi safely. >> reporter: the fbi is worried about security in benghazi, conducting their investigation and interviews in tripoli, 400 mile away from the scene of the attack. senator bob corker of the senate foreign relations committee wants to know why. he fired off a letter to james clapper, demanding answer, saying, in part, just ab days ago, the administration apparently judged it was appropriate for our consulate to be lightly guarded and it was safe for our embassador -- ambationz dorto come through the city with a small security de tail. what has changed in libya in such a short time that even fbi agents, our most elite personnel cannot safely enter the city? the consulate didn't have the standard marine guard. there are calls for the resignation of u.n. bambass dorsusan rice who, said that it appeared to be a spontaneous uprising against an anti-muslim video. >> five days went by.